Improvement in automatic boiler-feeders



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gfgateutl DANIEL L. F. CHASE, OF BOSTON, MASSACHUSETTS.

Leners Patent No. 88,774, me Amel 13, 1869.

IIIMZEROVIEMIEN'Tv IN AUTQMATIC BOILER-FEEDERS.

The Schedule referred to in ,these Letters Patent and making part of thesame.

To `all persons to whomv these presents may come:

Beit known that I, DANIEL L. F. CHASE, of Boston, ofthe county ofSuffolk, and State of Massachusetts, have invented a new and usefulApparatus for Regulating the Supply of Water to a Steam-Boiler orGenerator; and I do hereby declare the same to be fully described 'inthe following specification, and represented in the accompanyingdrawings, of which- Figure 1 is a top view;

Figure 2, a front side elevation;

Figure 3 is a longitudinal section; and

Figure 4 is a front end elevation of it.

Figure 5 denotes an end view of the apparatus as applied to asteam-boiler, the plane of the top surface of water in the boiler beinglevel with the plane ofthe middle of the Awater-'vessel of theapparatus.

1u the drawings- A denotes a metallic steam-tight hollow vesselsuspended from one arm of a balance lever, B, having its fulcrumsupported by knife-edge bearings a a and by standards b b, the latterbeing erected on' the frame, or table B', for sustaining the operativepartsof the apparatus.

The said lever has on its other arm a weight, C, to I overbalance theweight of the vessel A.

There is a pipe, D, opening out of the top, and an- Yother. pipe, E,opening out of the bottom of the vessel vA. The upper of these pipes isto connect with the steam-space s, of a boiler S, (see fig. 5,) by meansof a flexible pipe, t. municate with the water-space w of the boiler, bymeans of a ilexible pipe, u, the whole being so as to allow steam andwater from the boiler, when generating steam, to flow freely into thevessel A. This vessel is to be arranged at such a height with respect tothe proper level of safety, for the water to stand in the boiler, thatthe plane of the water-line may pass about through the middle' of thevessel.

The effect of this arrangement is such that the waterlevel in the vesselmust always be the same as that of the boiler.

Should the water fall in the boiler, it will fall in the vessel, and asa consequence there will be less weight in the vessel, and the weight Cwill' depress the longer arm of the lever.

As the water may rise inthe boiler it will ilow into and also risewithin the vessel, and when the weight of the water therein may besnlcient to overbalance f the weight on the longer arm of the lever,that is after the water may have attained its proper height in theboiler, the vessel will descend, and raise the longer arm of the lever.

A pitman, F, extends from the said arm of the lever up to atubular-sleeve, or lever Gr, which is pivoted within a standard, H,erected on the table, the pivots being shown at c c.

A shaft, I, extending through the sleeve, and sup- The lower of the saidpipes is to com` ported by it, so as to be capable of being revolvedwithin it, carries a pinion, d, at one end and a gear, e, at the other.

The said gear engages with another pinion, f, fixed on a driving-shaft,g, duly supported by the standard H, the whole being arranged in manneras represented.

The pinion d extends into the curved slottof a sector K, pivoted to anarm, k, projecting from the standard H.-

There is a rack, l, of teeth at the bottom ofthe slot i, and there isalso such another rack, fm, at the top of the said slot. somewhat beyondthe lower one, while the lower one also extends as much beyond the otherend of the upper rack, the whole being in manner as represented.

Furthermore, there is a curved iiange, n, projecting from the inner faceof the sector, the centre of the radius of curvature of the flange beingcoincident with that of the curved racks. y

A tongue, c', iixed to the sleeve by resting against the ange while thepinion (l maybe vorking in either of the racks, serves to keep thepinion in connection with the said rack until the former may pass theend thereof.

The-rack-slot extends beyond one end of each rack in the manner asrepresented at q and r, in order that the pinion d, after having passedout of engagement with either rack, may continue to revolve Withoutimparting any motion to the sector until the pinion may be next movedinto engagement with the other rack. Now, if we suppose thedriving-shaft to be putin revolution, and the sector to be so connectedwith a water-supply apparatus, that when the sector is moved in onedirection such apparatus shall be put in action, so as to discharge orfeed water into the boiler, and shall be thrown out of action during orafter a movement of the sector in the opposite direction, `we shall findthat we have a means of regulating the supply of water to the boiler inaccordance With the demand for it.

As the watermay fall within the boiler there will be a consequent fallof water in the vesselAuntil the weight v on the longer arm of thelever, from which the .said vessel is suspended, may depress such arm.When this may occur the pinion d will be moved into engagement with thelower rack of the sector, and while in engagement therewith, will movethe sector in one direction until the pinion may pass out of engagementwith the said rack. The pinion will next continue to revolve withoutproducing any further movementof the sector until a quantity of watermay have been driven into the boiler sufficient to raisethe level of theWater in the vessel A to the extent to cause such vessel to overbalancethe weight of the lever, and thereby descend and move the lever in amanner to move the pinion into engagement with the upper rack. As soonas this may take place'the sector will be put in motion in an The upperrack, at one end, projects opposite direction until the pinion may passoff' the end of the rack, or out of engagement with sneh rack.

The movement ofthe sector one Way will e'anse the water-supply apparatusto let Water flow or feed into the boiler, the reverse movement of theseetor causing such apparatus to arrest the owage of the water.

I would remark that instead of the sector, with its slot and racks, aslider, supported so as to be capable of sliding reotilinearly, may beemployed, it having within it a straight slot provided with racksarranged on opposite sides of the slot.

I would also remark that in the place ofthe weight on the lever, used.

a spring to act against the lever may be I claim the combination of thevessel A, and its lever B and weight O, with the pitrnan F, the slottedand double-racked sector K, the vibratory shaft I, and pinv ion d, andthe gears for revolving suol] shaft.

I also claim the combination and arrangement of the ange n and tonguecwith the duplex rack-sector K, vibratory pinion d, its shaft I,shaft-supporter and gears e and j, substantially as specified.

DANIEL L. F. CHASE.

Witnesses R. H. EDDY, SAMUEL N. PIPER.

